This reference page provides the dimensional and installation-related information for a Blind Flange 1 1/4 Inch Class 600 connection. Use it when checking piping layouts, reviewing flange details, coordinating a CAD model, or comparing this size with other blind flange references.
The source data below identifies the nominal size, flange thickness, weight, stud bolt information, bolt count, and hole diameter. The explanatory notes also clarify how to use those values during drafting and project review.
Blind Flange 1 1/4″ Class 600
Blind Flange 1 1/4″ Class 600 is used to seal the end of a piping system or close off a flange connection in Class 600 service. It is a solid flange without a center bore and is commonly used in industrial piping systems, maintenance isolation points, and future pipeline expansion connections where a higher pressure rating is required.
This dimension data is based on ANSI / ASME B16.5-2020.
Blind Flange 1 1/4″ Class 600 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 1 1/4″
- DN Size: DN32
- Flange Thickness: 20.6mm
- Weight: 2.3kg
- Stud Bolt Size: 5/8″ UNC (or M16) x 95 Long
- Number of Bolts: 4
- Hole Diameter: 3/4″ (19.05mm)
What Is a Blind Flange?
A blind flange is a blank flange used to close the end of a pipeline, vessel nozzle, or equipment connection. It provides a secure shutoff point and is often selected when future maintenance, inspection, or line extension may be required.
Common Applications
Blind Flange 1 1/4″ Class 600 is commonly used for:
- Pipe end closure
- Equipment isolation
- Valve and nozzle blanking
- Maintenance shutdown work
- Process and utility piping systems
- Higher pressure piping applications
CAD Drawing Download
This page includes the CAD drawing file for Blind Flange 1 1/4″ Class 600, which can be used for drafting, detailing, and piping layout coordination.
Available Blind Flange Class 600 Sizes
This size is part of the Blind Flange Class 600 series. Check other sizes in the same category to find matching dimension data and CAD files for your project.
Notes
Before fabrication or installation, always confirm the latest project requirements, flange material specification, gasket type, bolt length, and applicable pressure-temperature rating.
How to Use This Blind Flange Reference
A blind flange closes a flanged connection without providing a flow passage. In a piping arrangement, it may appear at a pipe end, equipment connection, valve connection, or an isolation point. Because the flange is solid, the drawing should show the blanking component and its mating connection clearly rather than treating it as a standard flanged pipe joint with an open bore.
For drafting, the listed flange thickness, bolt-hole information, and stud bolt specification help coordinate the connection with adjacent piping and equipment. Keep the bolt size and the hole diameter as separate checks: one describes the fastening hardware, while the other describes the clearance opening through the flange.
Drafting and Design Coordination
When using the downloadable DWG, verify the flange orientation, bolt-hole arrangement, mating-face relationship, and connection location against the project model. The CAD file is useful for layout and detailing, but it does not replace a project-specific review of material, gasket selection, bolting, assembly procedure, or pressure-temperature requirements.
For related research, compare this page with other blind flange dimensions, Class 600 flange references, pipe schedules, and flange terminology pages. These cross-checks can help identify matching nominal sizes and support piping isometric, fabrication, and equipment-nozzle coordination.
Selection Checks Before Fabrication
- Confirm that the nominal pipe size and flange class match the piping or equipment connection.
- Check the applicable material specification and project requirements.
- Verify the gasket type and facing requirements for the mating connection.
- Review stud bolt size, length, quantity, and installation requirements together.
- Confirm the applicable pressure-temperature rating before approving the connection.
- Use the source dimension list and CAD file together, then resolve any discrepancy with the responsible engineer or project specification.
Frequently Asked Questions
What is a Blind Flange 1 1/4 Inch Class 600 used for?
It is used to close a flange connection or seal the end of a piping system. Typical reference applications include equipment isolation, valve or nozzle blanking, maintenance shutdown work, and future connection points.
Does a blind flange have a center bore?
No. A blind flange is a solid flange without a center bore, so it provides closure rather than a flow path through the flange.
What bolt information is provided on this page?
The source data provides the stud bolt size, stated bolt length, number of bolts, and hole diameter. These values should be reviewed together with the mating flange and the project bolting requirements.
Can the DWG file be used for fabrication?
The DWG file is intended to support drafting, detailing, and piping layout coordination. Before fabrication, verify the drawing against the project specification, approved dimensions, material requirements, gasket selection, and applicable rating requirements.
Are the listed dimensions sufficient for final design approval?
No. The listed values are a dimensional reference. Final selection and approval also require confirmation of material, gasket type, bolt requirements, and pressure-temperature conditions for the specific project.